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Is java a fully object oriented programming or not? if not why?
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KanikaKG- Member Since Jul-2008 | Aug 4th, 2008
No. Java is not 100 % Pure OOP because of following three reasons:
1) It doesnot support Multiple inheritance.
2) It allows use of primitive data types which are not an objects.
3) It allows static methods to call without creating the instance.
This disobeys OOPs concepts?
Java isnt 100% pure OOPS coz if it were then everything should be classes and objects, whereas java still has primitive data type which violates the above said statement...SmallTalk is the only 100% pure OOPS languageChaitra
- Jun 6th, 2019
Java is not a pure object oriented programming language because of the primitive data type.
But java can be made 100% object oriented programming language by making use of wrapper classes.Amit Kumar
- May 21st, 2018
Sorry, I am completely agree that java is a pure object oriented language. First of all answer me one question , what do you mean by object oriented programming ? object oriented programming is a conc...
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Output of Java Program
What is the output of the following program?class A{ public static void main(String[] s) { System.out.println(s[1] + s[2] + s[3]);}}java A 12345Options(i) 1(ii) 12(iii)1234(iv)234(v) Compilation Error
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abuthahir.d- Member Since Jan-2008 | Apr 14th, 2008
Khadar , i tried this code . it gives that exception
for the foll reason :
when u give a CLA(command line argument) , it will be inserted in the index 0 of the array and then will proceed to 1 ,2 ....
so as per the question , "12345" will be at s[0] . and length of that aray will be 1when u try to access s[1] , we are trying for 2nd element which is unavailable.....
Hope this answers u :-)shyamasundar
- Jun 2nd, 2018
(v) Compilation Error
shani
- Mar 14th, 2018
(v) Compilation Error
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How would you pass a java integer by reference to another function
Mayank
- Mar 13th, 2018
I don't think that is right because if it was then changing the value inside the called function should reflect the change when the passed variable is accessed in calling function.
sourabharvikar3
- May 4th, 2011
what is point behind sending integer by reference???Still if you want to do so... lookclass Demo{private int i;public static void main(String[] ar){ Demo d=new Demo();&nb...
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Need of Polymorphism
What is need of polymorphism in Java? What could have happen if polymorphism is not present?
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syamala235- Member Since Mar-2010 | Apr 8th, 2010
Polymorphism in simple terms means one name many forms. Polymorphism enables one entity to be used as a general category for different types of actions. The specific action is determined by the exact nature of the situation.
Polymorphism exists in three distinct forms in Java:
• Method overloading
• Method overriding through inheritance
• Method overriding through the Java interfacePrashant kumar gupta
- Oct 28th, 2017
We have different behaviors in different situations and in front of different people. A man behaves differently with his father, when he is with his friend he has different behavior. Another best exa...
suraj
- Jun 19th, 2017
Polymorphism means one thing in many form. or one person different behavior is called polymorphism.
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Can we override the main method?
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ashish_setia- Member Since Oct-2006 | Oct 3rd, 2006
check out this example
class Checkmain{
public static void main(String args[]){
args[1]="ashish";
System.out.println("hello ");
}
}
class Checkmain1 extends Checkmain{
public static void main(String args[]){
System.out.println("how r u");
}}
class Jo{
public static void main(String args[]){
String S[]=new String[10] ;Checkmain.main(S);
Checkmain1.main(S);
}}vivek
- Aug 26th, 2017
Yes you can only do that by overriding main method signature for eg main(String[] args) to main(). Certainly there are no other ways to do that because JVM needs strings array arguments to take comma...
Dharmendra Singh
- Sep 15th, 2016
yes we can"java public class HelloWorld { // arguments are passed using the text field below this editor public static void main(String[] args) { String []s =new Str...
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What is the difference between abstract class & Final class
Manjunath_7_89
- Mar 25th, 2016
Abstract Class
1. Could be Inherited.
2. Couldnt instatiated.
3. Could add few more methods.
4. Incomplete class
Final Class
1. Final version of Class
2. Couldnt be inherited.
3. Could be instantiated.
4. Couldnt add any more methods.baban
- Feb 11th, 2016
Abstract class cannot create object but final class create a object
abstract class which have must a subclassed but final class which have no subclassed -
Why java is not 100% object oriented language??
i have not ..asked in TCS interview ..if any one have plz answer me on er.anuj.mittal@gmail.com
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What is MVC architecture
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Answered by: Mitchel K
- Jun 27th, 2005
A design pattern describes a proven solution to a recurring design problem, placing particular emphasis on the context and forces surrounding the problem, and the consequences and impact of the solution.
There are many good reasons to use design patterns. Here are three:
1) They are proven. You tap the experience, knowledge and insights of developers who have used these patterns successfully in their own work.
2) They are reusable. When a problem recurs, you don't have to invent a new solution; you follow the pattern and adapt it as necessary.
3) They are expressive. Design patterns provide a common vocabulary of solutions, which you can use to express larger solutions succinctly.
The goal of the MVC design pattern is to separate the application object (model) from the way it is represented to the user (view) from the way in which the user controls it (controller).
The MVC architecture has the following benefits:
1) Multiple views using the same model: The separation of model and view allows multiple views to use the same enterprise model. Consequently, an enterprise application's model components are easier to implement, test, and maintain, since all access to the model goes through these components.
2) Easier support for new types of clients: To support a new type of client, you simply write a view and controller for it and wire them into the existing enterprise model.
3) Clarity of design: By glancing at the model's public method list, it should be easy to understand how to control the model's behavior. When designing the application, this trait makes the entire program easier to implement and maintain.
4) Efficient modularity: of the design allows any of the components to be swapped in and out as the user or programmer desires - even the model! Changes to one aspect of the program aren't coupled to other aspects, eliminating many nasty debugging situations. Also, development of the various components can progress in parallel, once the interface between the components is clearly defined.
5) Ease of growth: Controllers and views can grow as the model grows; and older versions of the views and controllers can still be used as long as a common interface is maintained.
6) Distributable: With a couple of proxies one can easily distribute any MVC application by only altering the startup method of the application.yura
- Dec 2nd, 2015
Everyone explained what is MVC... This is outcome of one more design pattern called "separation of concerns", which means a "view" should only handle rendering logic of the model and should not be co...
Anil Nivargi
- Jun 26th, 2014
The MVC consists of three kinds of Objects i.e Model,View and Controller. Lets start explaining one by one. 1) Model- It handles data processing and database works part. Model processes event...
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Can array with zero length exist in Java?
swapnil
- Sep 17th, 2013
Yes, array size in java is always 0 bz array is start with 0th location
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MVC architecture
what is the difference between MVC1 & MVC2 in Java?
sivapurammani
- Jul 10th, 2013
MVC(Model-View-Controller) :: This type of architecture makes our code to be reusable and separation of code. View :: Which presents the modal data, example if we are presenting any tabular data or c...
Prasad MN
- Mar 11th, 2013
MVC1: Its a model view Controller architecture 1 that means all the presentation logic and business logic is mixed up. If any modification is required on its impact on the logic. Difficult ...
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Adding Method in Java
Hi
I have interface in that interface 3 methods are there , after some days client said that,i want to add one more method in that interface ,so how can add 4 method so that the implemented class did not affect,
Thanks
Kalins Naik
sivapurammani
- Jul 4th, 2013
If we implement any new method in Interface then by default that method is public and abstract, So the classes which are implementing that interface should implement that method that is one way in whi...
akii
- Apr 30th, 2013
Make a class abstract in this class you do not need to implement all methods of interface .
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Can a method be static and synchronized
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Answered by: Srimant Misra
- Aug 12th, 2005
A static method can be synchronized. If you do so, the JVM will obtain a lock on the java.lang.Class instance associated with the object. It is similar to saying:
synchronized(XYZ.class)
{
}Akii
- May 21st, 2013
If you synchronized on static method ,its lock on class level not only that method.
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Platform Independence
Why platform independence is needed in real world ?
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Object Creation
In how many ways we can create an object? Explain with example.
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vishrutha- Member Since Feb-2009 | Feb 13th, 2009
1. Using new keyword
This is the most common way to create an object in java. I read somewhere that almost 99% of objects are created in this way.MyObject object = new MyObject();
2. Using Class.forName()
If we know the name of the class & if it has a public default constructor we can create an object in this way.MyObject object = (MyObject) Class.forName("subin.rnd.MyObject").newInstance();3. Using clone()
The clone() can be used to create a copy of an existing object.MyObject anotherObject = new MyObject();
MyObject object = anotherObject.clone();4. Using object deserialization
Object deserialization is nothing but creating an object from its serialized form.ObjectInputStream inStream = new ObjectInputStream(anInputStream );
MyObject object = (MyObject) inStream.readObject();5. Using class loader
one more is through creation of object using classloader likethis.getClass().getClassLoader().loadClass(com.amar.myobject).newInstance();
Now you know how to create an object. But its advised to create objects only when it is necessary to do so.
sampra
- Mar 13th, 2012
There are 5 ways:
1-> new operaotor
2-> Class.forName()
3-> Cloning
4-> Deserialization
5-> Class.newInstance()Max
- Sep 7th, 2011
All sorts of syntax sugar can also be named: 6. New String as a result of concatenation: String varName = getClass().getName(); //to avoid compile-time optimization String a = "Prefix" + varName; ...
Core Java Interview Questions
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